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• INSUFFICIENT PRESSURE SUPPORT ALARM
Is triggered if for 3 breaths in a row the maximum mask pressure achieved at
inspiratory to expiratory transition is either <87.5% of the absolute mask pressure
targetted at that point, or < absolute mask pressure targetted minus 1 cmH
2
O,
whichever is the lower.
• HIGH LEAK ALARM
Leak exceeds 30 L/min for more than 20 seconds.
• FLOW BLOCKED ALARM
Flow is less than 6 L/min for more than 20 seconds.
IEC 601-1 CLASSIFICATIONS
Class II, Type CF
Class II medical electrical equipment provides protection against electric shock either
by double insulation or reinforced insulation and does not require a protective earth.
Table 3: Displayed values
Table 4: Maximum low impedance flow at stated pressures
Value Range Accuracy
Display
Resolution
Proximal cuff
Pressure -3 to 40 cmH
2
O0.5 cmH
2
O 0.1 cmH
2
O
Mass flow sensor
Leak 0–99 litres per
minute
+/- 12 litres per
minute
1 litre per breath
Respiratory rate 8–30 breaths per
minute
+/- 10% 1 breath per
minute
Tidal volume 0–4500 millilitres +/- 10% 1 millilitre
Minute ventilation 0–40 litres per
minute
+/- 10% 0.1 litres per
minute
Target MV 0–40 litres per
minute
+/- 10% 0.1 litres per
minute
Pressure
(cmH
2
O)
Flow (L/min)
4.2 217
8.6 218
13.0 219
eng.book Page 44 Friday, November 3, 2006 2:43 PM